Prices go up (in general) in inflation for both staples and luxuries (although different goods can inflate differently as mentioned). It is not that average folks increase consumption of what they need thus increasing demand, it is that they buy (most) of what they need, as before, but they spend more to do it because the demand is inelastic. When they spend more on the needs, there isn't as much left over for what they want... or... there just isn't enough for what they need. This inflationary effect causes a lowered living standard and even hardship depending where people were in their budgeting/disposable income. Average people spend a higher proportion on needs and have less disposable income. (see also: elastic demand and substitution)
The poors have even less disposable income and it is far easier to push them to hardship. The middles get pushed toward the poors. Inflation sucks for everyone, and sucks for the poors most of all. Unemployment really sucks for the few percent unemployed, but not so much for the vast majority of employed.